Rinse the deveined shrimp and pat dry with paper towels.
Add shrimp blackening spices to a small bowl and stir to combine; set aside.
Place a clean, dry frying pan or cast iron skillet over high heat until it starts to smoke. Keep kitchen area well ventilated.
Toss the shrimp in melted butter and then dredge both sides in blackening spices. Press spices to adhere if necessary.
Immediately sear shrimp in preheated pan over high heat for 30-60 seconds on each side. Don't overcook, as they will dry out. Serve immediately with slices of lemon. Or, use them as part of another recipe, like shrimp and grits.
Notes
If you have never cleaned shrimp, don't worry; it's very easy to do.
Deveining shrimp is not a difficult process. Just follow these simple steps:
Start by carefully removing the shells from all your shrimp.
Use a paring knife to gently scrape down the curved back of the shrimp, then use the tip to extract the thin, grayish vein.
Completely remove the rest of the vein with a pair of kitchen tweezers or your finger.
Repeat the process with the remainder of the shrimp. Give them a nice rinse with cool water and pat dry.